Uart Interface; Uart Design Guide - SimCom SIM7000G User Manual

Table 10: RESET pin electronic characteristic
Symbol Description
The active low level time impulse on RESET pin
T
reset
to reset module
V Input high level voltage
IH
V Input low level voltage
IL
3.3

UART Interface

SIM7000 provides a 7-wire UART (universal asynchronous serial transmission) interface as DCE
(Data Communication Equipment). AT commands and data transmission can be performed through
UART interface.
Moreover, if users need to use two UART simultaneously, SIM7000 also provides a 2-wire UART
interface multiplex from GPIO. The GPIO0 multiplex as TXD of the 2-wire UART, and the GPIO1
multiplex as RXD of the 2-wire UART. Standard version cannot support this function
3.3.1

UART Design Guide

The following figures show the reference design.
SIM7000 _Hardware Design _V1.00
Figure 13: UART full modem
Figure 14: UART null modem
Smart Machine Smart Decision
Min. Typ.
50 100
1.2 1.8
-0.3 0
2017-05-23
Max. Unit
500 ms
2.1 V
0.8 V